Survivor Pool Math: Five "Safe" Picks Have Lost. Was the Market Wrong, or Were You?

Through four weeks, teams favored by seven points or more are 10-5 straight up. The Chargers account for two of those losses on their own, and Week 2 alone took out three of the five big favorites on the board. If you're still alive in a survivor pool, you probably dodged at least one of them.

The obvious takeaway is that big favorites can't be trusted this year. The numbers point somewhere more useful.

Strip the vig first

Here are the five losers with their midweek moneylines, the probability the listed price implies, and the probability once the bookmaker's margin is removed:

The two sides of each market add up to about 104%, the hold that every moneyline markets market builds in. Scale both sides back to 100% and none of these five was better than about 81%. Seattle at Washington was a 72% proposition, closer to a three-in-four shot than a lock.

Was 10-5 bad luck?

Mostly, yes. Fifteen favorites at roughly 80% each should produce about three losses. Getting five or more happens about 16% of the time, so roughly one season start in six looks like this by chance alone. At 78%, it's closer to one in five.

That matters for how you react. A 10-5 start is weak evidence that big favorites are overpriced, and on its own it isn't a reason to start fading them. What it does show is how little room survivor leaves you. At 80% a week, the chance of getting through five straight weeks is 33%. Over all 18 weeks, it's under 2%.

Price the pick, not just the team

Because almost nobody runs the table, survivor is a contest against the rest of your pool as much as against the schedule. A pick's value depends on its win probability and on how many entries go down with you if it loses.

A simple illustration with round numbers. Say Team A is an 81% no-vig favorite and 40% of your pool is on it. Team B is a 74% favorite carrying 5% of the pool, and everyone else is spread across teams averaging 78%. Take Team A and you survive more often, but when you do, you share the pot with most of the field. Take Team B and you survive less often, but when Team A loses, nearly half the pool goes with it. Run the expected share of the pot, and Team B comes out about 4% ahead in that single week.

That edge grows with pool size and with how lopsided the picking gets. In a large pool, fading the most popular big favorite in a week where a slightly smaller favorite exists is often the higher-equity play, even though it feels like the riskier one.

Future value and the Chargers lesson

The other cost of a big favorite is the team you burn. A team with several more strong spots on its schedule is worth more in your back pocket than a team that's only a big favorite once. Spending it in Week 2 at 74% is a poor trade if it would be an 85% play twice in November.

The Chargers show the timing problem. They were priced as a double-digit favorite in Week 1 and a seven-point favorite in Week 2, and lost both by 12. Early-season prices lean heavily on last year and the offseason. By midseason the market has real information to work with, which is an argument for saving your strongest teams for later weeks.

Walt's weekly NFL picks against the spread go up every week, and you can put the math to work in the WalterFootball Survivor Contest.